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APOE genotype influences functional status among elderly without dementia

S M Albert1, B Gurland, G Maestre

  • 1Department of Neurology, Columbia University, New York, New York 10032, USA.

American Journal of Medical Genetics
|December 18, 1995
PubMed
Summary

The apolipoprotein E4 (APOE-E4) gene variant is linked to reduced daily functioning in older adults, even without cognitive decline. This APOE-E4 association impacts functional abilities independently of cognitive status.

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Area of Science:

  • Neuroscience
  • Genetics
  • Gerontology

Background:

  • The apolipoprotein E4 (APOE-E4) allele is a known risk factor for Alzheimer's disease (AD).
  • Understanding its impact on functional abilities in cognitively intact individuals is crucial for early intervention.

Purpose of the Study:

  • To investigate the association between APOE-E4 genotype and functional status in a diverse group of non-demented elders.
  • To determine if APOE-E4 affects function independently of cognitive performance, demographics, and comorbidities.

Main Methods:

  • A multicultural sample of 218 community-dwelling elders without cognitive impairment or neurological disability was assessed.
  • APOE-E4 genotype, neuropsychological performance, functional status, and comorbidities were evaluated.
  • Path analysis was used to explore independent associations.

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Main Results:

  • Individuals with the APOE-E4 allele showed significantly poorer functional status compared to those without (OR = 2.5).
  • Only 28% of APOE-E4 carriers reported no functional limitations, versus 50% of non-carriers (P < .01).
  • The association between APOE-E4 and poorer function persisted independently of cognitive status, age, gender, education, and comorbidities.

Conclusions:

  • The APOE-E4 genotype is independently associated with reduced functional ability in cognitively normal older adults.
  • This suggests a direct impact of APOE-E4 on functional decline, not solely mediated by cognitive impairment.
  • Findings highlight the importance of genetic predisposition in maintaining functional independence in aging populations.